Generation Iv
Unaware
Ignores any change in ability by the foe.
Detailed Effect
This Pokémon ignores other Pokémon's stat modifiers for the purposes of damage and accuracy calculation. Effectively, this affects modifiers of every stat except Speed. The power of Punishment and Stored Power is calculated as usual. When this Pokémon hurts itself in confusion, its stat modifiers affect damage as usual.
Pokémon With Unaware
15 canonical Pokémon forms can have this Ability.

Bidoof
Bibarel 
Woobat
Swoobat
Cosmog
Dondozo
Clefable
Wooper 
Quagsire
Pyukumuku
Fuecoco
Crocalor
Skeledirge
Clodsire
Paldean Wooper